Abstract
Covalent lignin-carbohydrate (LC) linkages exist in lignocellulose from wood and groups herbaceous plants. In wood, they consist of ester and ether linkages through sugar hydroxyl to the α-carbanol of phenylpropane subunits in lignin. In grasses, ferulic and p-coumaric acids are esterified to hemicelluloses and lignin, respectively. Hemicelluloses also contain substitutents and side groups that restrict enzymatic attack. Watersoluble lignin-carbohydrate complexes (LCCs) often precipitate during digestion with polysaccharidases, and the residual sugars are more diverse than the bulk hemicellulose. A number of microbial esterases and hemicellulose polysaccharidases including acetyl xylan esterase, ferulic acid esterase, and p-coumaric esterase attack hemicellulose side chains. Accessory hemicellulases include α-l-arabinofuranosidase and α-methyl-glucuranosidase. Both of these side chains are involved in LC bonds. β-Glucosidase will attach sugar residues to lignin degradation products and when carbohydrate is attached to lignin, lignin peroxidase will depolymerize the lignin more readily.
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Abbreviations
- APPL:
-
acid precipitable polymeric lignin
- CBQase:
-
cellobioquinone oxidoreductase
- LC:
-
lignincarbohydrate
- LCC(s):
-
lignin-carbohydrate complex
- DHP:
-
Dehydrogenative polymerisate
- DMSO:
-
dimethylsulfoxide
- DP:
-
degree of polymerisation
- MWEL:
-
milled wood enzyme lignin
- MWL:
-
milled wood lignin (not digested with carbohydrases)
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Jeffries, T.W. Biodegradation of lignin-carbohydrate complexes. Biodegradation 1, 163–176 (1990). https://doi.org/10.1007/BF00058834
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DOI: https://doi.org/10.1007/BF00058834